What substance is called the “spreading factor?” How does the “spreading factor” aid an organism in its quest to penetrate the host cell?

What substance is called the “spreading factor?” How does the “spreading factor” aid an organism in its quest to penetrate the host cell?

What are the three major species of Staphylococcus? Why one of them is more pathogenic compared to the other two species? Which factor determines the pathogenesis of the organisms?
What substance is called the “spreading factor?” How does the “spreading factor” aid an organism in its quest to penetrate the host cell?
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